<template>
  <div>
    <p>请选择你要购买的书籍</p>
    <ul>
      <li v-for="item in arr" :key="item">{{item.name}} <button @click="add(item.name)">买书</button></li>
    </ul>
    <table border="1" width="500" cellspacing="0">
      <tr>
        <th>序号</th>
        <th>书名</th>
        <th>单价</th>
        <th>数量</th>
        <th>合计</th>
      </tr>
      <tr  v-for="(item,index) in arr" :key="index">
        <th>{{index+1}}</th>
        <th>{{item.name}}</th>
        <th>{{item.price}}</th>
        <th>{{item.count}}</th>
        <th>{{item.price*item.count}}</th>
      </tr>
    </table>
    <p>总价格为: </p>
  </div>
</template>

<script>
export default {
  name: 'WorkspaceJsonApp',

  data() {
    return {
       arr: [
        {
       
          name: "水浒传",
          price: 107,
          count: 0,
        },
        {
         
          name: "西游记",
          price: 192,
          count: 0,
        },
        {
          
          name: "三国演义",
          price: 219,
          count: 0,
        },
        {
       
          name: "红楼梦",
          price: 178,
          count: 0,
        },
      ],
    };
  },

  methods: {
      add(name){
           this.arr.forEach((item,index)=>{
        if (item.name == name) {
          this.arr[index].count++
        }
      })
      }
  },
};
</script>

<style scoped>

</style>